Wat was the son of a chandler and was raised in the trade, however he found he had more talent for making lutes. When he was twelve years old he ran away to join a musician troupe. He had wandered half the Reach before coming to King's Landing in search of patronage.
A Feast for Crows
As part of the Tyrell entourage, the Blue Bard sings at the wedding of Tommen I Baratheon and Margaery Tyrell. Queen Cersei Lannister connives to use the Blue Bard as a pawn in her efforts to remove Margaery from King's Landing. She has him arrested and sent to the dungeons for seducing Margaery, though he claims never to have done so. In front of Cersei, he is stripped and mutilated by Qyburn, who removes one each of his eyes and nipples, and is told to tell the story as Cersei wants him to. Under torture he names Ser Osney Kettleblack, Ser Tallad the Tall, Ser Lambert Turnberry, Jalabhar Xho, Hugh Clifton, Ser Mark Mullendore, Ser Bayard Norcross, and Hamish the Harper as Margaery's lovers.
The Blue Bard also names Ser Loras Tyrell and the Redwyne twins, Ser Horas and Ser Hobber, but Cersei has him recant the three; Loras because the accusation is not credible and the twins because she needs the support of House Redwyne and their ships to deal with the ironborn. After Margaery is successfully framed, Cersei has the Blue Bard arrested again. He is tortured once again by the Faith but continues to tell the story Cersei wants him to.